From the WP – Uncle Sam Buys Online Realty:
The “issue boils down to whether a listing agent can effectively claim ownership rights to a home listing, deciding where and when it can be displayed on the Internet, for the duration of the listing contract, which usually runs between 60 and 90 days,” The Post reported. “The Realtors’ group argues that agents work hard to get listings and so should be entitled to choose whether a home can also be displayed on a competitor’s Web site. ‘In the past, another broker would never have been able to run a classified ad in the newspaper advertising my listing,’ Janik said. ‘You couldn’t come put your yard sign in front of my listing. It’s the same thing.'” Janik also told the paper that it wasn’t about targeting online brokerages specifically.

I expect we will be reading and writing much more about this in the near future.